Pliable flanges absorb vibration and can be stretched up to 1/16 In. to fit in-between sizes

The RP-5161 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a carbon fiber top for strength and durability. The carbon fiber element adds to the light-weight design and gives this filter a smooth glass like finish. The RP-5161 is a clamp-on filter that has a flange inside diameter of 3-1/4 inches and length of 2 inches. The base is 18-3/4 by 5 inches and the filter height is 4-5/8 inches.